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Preparation method of wide-temperature high-efficiency non-toxic SCR (Selective Catalytic Reduction) catalyst and application thereof

An SCR catalyst and high-efficiency technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., to reduce costs, make up for low denitration efficiency, and stabilize denitration efficiency.

Inactive Publication Date: 2019-03-26
DATANG NANJING ENVIRONMENTAL PROTECTION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem of high denitrification efficiency, wide temperature window and high stability and N 2 Selective performance, providing a new type of wide-temperature high-efficiency non-toxic SCR catalyst, preparation method and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Catalyst preparation: Add 27.00 g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and 8.45 g manganese sulfate monohydrate (MnSO 4 ·H 2 O), stirred until completely dissolved, recorded as solution A. Then add 60 mL of 25% ammonia water to 1 L of deionized water, stir evenly, namely solution B. The solution A was quickly poured into the solution B, stirred for 0.5 h, filtered with suction, dried at 80 °C for 12 h, and then calcined at 250 °C for 3 h. Finally, granulate and pass through a 40-60 mesh sieve to obtain a new wide-temperature, high-efficiency, non-toxic SCR catalyst.

[0021] 2. Catalyst performance test: Take 0.3g of the prepared catalyst and put it into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube is 0.8 cm, and the simulated flue gas is composed of NO, NH 3 , O 2 and N 2 Composition, of which NO 1500 ppm, NH 3 1500 ppm, O 2 3 %, airspeed 200,000 h -1 , the reaction temperature is 200~450°C, and the reaction tail gas is ...

Embodiment 2

[0025] 1. Preparation of the catalyst: 16.20 g of ferric chloride hexahydrate (FeCl 3 ·6H 2 O), 47.26 g ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O) and 16.8 g titanium sulfate (Ti(SO 4 ) 2 ), stirred until completely dissolved, and recorded as solution A. Then add 120 mL of 25% ammonia water to 1 L of deionized water, and stir evenly, namely solution B. The solution A was quickly poured into the solution B, stirred for 0.5 h, filtered with suction, dried at 80 °C for 12 h, and then calcined at 400 °C for 4 h. Finally, granulate and pass through a 40-60 mesh sieve to obtain a new wide-temperature, high-efficiency, non-toxic SCR catalyst.

[0026] 2. Catalyst performance test: Take 0.3 g of the prepared catalyst and put it into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube is 0.8 cm, and the simulated flue gas is composed of NO, NH 3 , O 2 and N 2 Composition, of which NO 1500 ppm, NH 3 1500 ppm, O 2 3%, airspeed 200,000 h -1 , the reacti...

Embodiment 3

[0030]1. Catalyst preparation: Add 27.00 g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and 13.2 g nickel sulfate hexahydrate (NiSO 4 ·6H 2 O), stirred until completely dissolved, recorded as solution A. Then add 60mL of 25% ammonia water to 1 L of deionized water, stir evenly, namely solution B. The solution A was quickly poured into the solution B, stirred for 0.5 h, filtered with suction, dried at 80 °C for 12 h, and then calcined at 380 °C for 3 h. Finally, granulate and pass through a 40-60 mesh sieve to obtain a new wide-temperature, high-efficiency, non-toxic SCR catalyst.

[0031] 2. Catalyst performance test: Take 0.3 g of the prepared catalyst and put it into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube is 0.8 cm, and the simulated flue gas is composed of NO, NH 3 , O 2 and N 2 Composition, of which NO 1500 ppm, NH 3 1500 ppm, O 2 3%, airspeed 200,000 h -1 , the reaction temperature is 200~450°C, and the reaction tail gas is dete...

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Abstract

The invention discloses a preparation method of a novel wide-temperature high-efficiency non-toxic SCR (Selective Catalytic Reduction) catalyst and an application thereof. The general formula of the catalyst is AxFe(3-x)O4, wherein x is less than or equal to 1; and A is one or a combination of titanium, magnesium, manganese and nickel. The wide-temperature non-toxic iron-based denitration catalystis prepared by a coprecipitation method, the cost is reduced, and the defects that the traditional Fe-based SCR catalyst is low in denitration efficiency, narrow in temperature window, poor in stability performance and poor in selectivity can be effectively overcome. Under the conditions that the temperature is 200-450 DEG C, the air speed reaches 3000-200000h<-1> and nitric oxide flue gas contains 0-2700mg / m<3> of SO2 and 0-20% of water vapor, the denitration efficiency of the catalyst is stabilized at 90% or higher, and the N2 selectivity is stabilized at 95% or higher. The catalyst disclosed by the invention is applicable to nitric oxide emission control of fixed source flue gas in thermal power plants, coking plants and the like.

Description

technical field [0001] The invention relates to an SCR catalyst and a preparation method thereof, in particular to a wide-temperature high-efficiency non-toxic SCR catalyst and a preparation method thereof, belonging to the technical field of air pollution control. Background technique [0002] China is a big coal consumer, with coal consumption reaching 3.779×10 in 2016 9 t, of which about 50% is used for power generation. Pollutants emitted from coal-fired power plants are particulate matter, sulfur dioxide, and nitrogen oxides (NO x ) mainly. The discharge of nitrogen oxides into the atmosphere will cause problems such as acid rain and photochemical smog, and cause serious damage to the environment, crop growth and human production and life. Since 2015, my country has fully implemented ultra-low emission and energy-saving transformation of coal-fired power plants, and strictly controlled the emission of nitrogen oxides from industrial sources. For example, "ultra-low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01D53/86B01D53/56
CPCB01D53/8628B01J27/053
Inventor 王虎唐幸福纵宇浩陈俊逍陈雅欣李超江晓明
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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